Methods and apparatuses for a trp related beam failure detection procedure and a mobility scenario

Abstract

Methods and apparatuses for a transmission reception point (TRP) related beam failure detection procedure and coexistence of a Layer1/Layer2 (L1/L2) mobility scenario and a Layer3 (L3) mobility scenario under a 3rd Generation Partnership Project (3GPP) 5G system or the like. The method can be performed by a user equipment (UE) and includes: receiving, from a serving cell, configuration information related to two or more transmission reception points (TRPs) of the serving cell ( 401 ); detecting a beam failure of a TRP within the two or more TRPs ( 402 ); transmitting a beam failure recovery (BFR) request, wherein the BFR request includes information related to the TRP ( 403 ); before receiving a response for the BFR request from the serving cell, detecting a further beam failure of a further TRP within the two or more TRPs ( 404 ); and monitoring a physical downlink control channel (PDCCH) within a period ( 405 ).

What is claimed is: 
     
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         16 . A user equipment (UE) for wireless communication, comprising:
 at least one memory; and   at least one processor coupled with the at least one memory and configured to cause the UE to:
 receive, from a serving cell, configuration information related to two or more transmission reception points (TRPs) of the serving cell; 
 detect a first beam failure of a first TRP within the two or more TRPs; 
 transmit a first beam failure recovery (BFR) request, wherein the first BFR request includes information related to the first TRP; 
 detect, before receiving a response for the first BFR request from the serving cell, a second beam failure of a second TRP within the two or more TRPs; and 
 monitor a physical downlink control channel (PDCCH) within a period. 
   
     
     
         17 . The UE of  claim 16 , wherein the at least one processor is configured to cause the UE to:
 perform, in response to ending of the period, a random access channel (RACH) procedure.   
     
     
         18 . The UE of  claim 17 , wherein the RACH procedure is based on configuration information related to a BFR procedure for the serving cell. 
     
     
         19 . The UE of  claim 16 , wherein one or more of:
 the period is associated with a time window in a time domain, wherein the time window starts upon transmitting the first BFR request or the second BFR request, and wherein a length of the time window is configured by the serving cell; or   the period is associated with a timer, the period starts in response to starting of the timer, and the period ends in response to an expiry of the timer or stopping of the timer.   
     
     
         20 . The UE of  claim 19 , wherein the timer is configured to start in response to one or more of:
 transmission of the first BFR request, and detection of the second beam failure;   transmission of the first BFR request; or   detection of the second beam failure, and transmission of the second BFR request.   
     
     
         21 . The UE of  claim 19 , wherein the at least one processor is configured to cause the UE to stop the timer in response to one or more of:
 receiving the response for the first BFR request from the serving cell; or   receiving a response for a second BFR request from the serving cell.   
     
     
         22 . A user equipment (UE) for wireless communication, comprising:
 at least one memory; and   at least one processor coupled with the at least one memory and configured to cause the UE to:
 receive, from a serving cell, configuration information of a cell switch procedure related to one or more candidate cells, wherein the cell switch procedure is performed based on that a cell switch condition of the cell switch procedure is met or an activation indication of the cell switch procedure is received; and 
 receive, from the serving cell, at least one of:
 a normal handover command; 
 a dual active protocol stack (DAPS) handover command; or 
 configuration information regarding a conditional handover (CHO) procedure. 
 
   
     
     
         23 . The UE of  claim 22 , wherein the at least one processor is configured to cause the UE to:
 receive, by a physical layer or a medium access control (MAC) layer of the UE, the activation indication from the serving cell, wherein the activation indication includes one or more of:
 a physical layer identifier (PCID) of a candidate cell within the one or more candidate cells; or 
 an index of the candidate cell, wherein the index is associated with the PCID of the candidate cell or a cell global identifier (CGI) of the candidate cell. 
   
     
     
         24 . The UE of  claim 23 , wherein the at least one processor is configured to cause the UE to:
 indicate, in response to receiving the activation indication by the physical layer or the MAC layer of the UE and in response to receiving the configuration information regarding the CHO procedure, and by one or more of the physical layer or the MAC layer of the UE, the activation indication to a RRC layer of the UE.   
     
     
         25 . The UE of  claim 24 , wherein the at least one processor is configured to cause the UE to:
 in response to receiving, by the RRC layer of the UE, the activation indication from one or more of the physical layer or the MAC layer of the UE:
 stop, by the RRC layer of the UE, an evaluation of the condition of the CHO procedure and not triggering the CHO procedure; or 
   in response to meeting the condition of the CHO procedure, one or more of:
 perform the cell switch procedure in priority; or 
 select a candidate cell with a best channel quality from the cell switch procedure and the CHO procedure for cell switch. 
   
     
     
         26 . The UE of  claim 22 , wherein the at least one processor is configured to cause the UE to:
 receive a radio resource control (RRC) reconfiguration message from the serving cell, wherein the RRC reconfiguration message includes an indication to indicate that the RRC reconfiguration message can be applied after a physical layer or a MAC layer of the UE receives the activation indication from the serving cell.   
     
     
         27 . The UE of  claim 26 , wherein the at least one processor is configured to cause the UE to:
 check, in response to receiving the RRC reconfiguration message, compliance of the received RRC reconfiguration message.   
     
     
         28 . The UE of  claim 27 , wherein the at least one processor is configured to cause the UE to:
 report, in response to the RRC layer of the UE not compliant with the RRC reconfiguration message, a compliance failure to the serving cell.   
     
     
         29 . A processor for wireless communication, comprising:
 at least one controller coupled with at least one memory and configured to cause the processor to:
 receive, from a serving cell, configuration information related to two or more transmission reception points (TRPs) of the serving cell; 
 detect a first beam failure of a first TRP within the two or more TRPs; 
 transmit a first beam failure recovery (BFR) request, wherein the first BFR request includes information related to the first TRP; 
 detect, before receiving a response for the first BFR request from the serving cell, a second beam failure of a second TRP within the two or more TRPs; and 
 monitor a physical downlink control channel (PDCCH) within a period. 
   
     
     
         30 . The processor of  claim 29 , wherein the at least one controller is configured to cause the processor to:
 perform, in response to ending of the period, a random access channel (RACH) procedure.   
     
     
         31 . The processor of  claim 30 , wherein the RACH procedure is based on configuration information related to a BFR procedure for the serving cell. 
     
     
         32 . The processor of  claim 29 , wherein one or more of:
 the period is associated with a time window in a time domain, wherein the time window starts upon transmitting the first BFR request or the second BFR request, and wherein a length of the time window is configured by the serving cell; or   the period is associated with a timer, the period starts in response to starting of the timer, and the period ends in response to an expiry of the timer or stopping of the timer.   
     
     
         33 . The processor of  claim 32 , wherein the timer is configured to start in response to one or more of:
 transmission of the first BFR request, and detection of the second beam failure;   transmission of the first BFR request; or   detection of the second beam failure, and transmission of the second BFR request.   
     
     
         34 . The processor of  claim 32 , wherein the at least one controller is configured to cause the processor to stop the timer in response to one or more of:
 receiving the response for the first BFR request from the serving cell; or   receiving a response for a second BFR request from the serving cell.   
     
     
         35 . A processor for wireless communication, comprising:
 at least one controller coupled with at least one memory and configured to cause the processor to:
 receive, from a serving cell, configuration information of a cell switch procedure related to one or more candidate cells, wherein the cell switch procedure is performed based on that a cell switch condition of the cell switch procedure is met or an activation indication of the cell switch procedure is received; and 
 receive, from the serving cell, at least one of:
 a normal handover command; 
 a dual active protocol stack (DAPS) handover command; or 
 configuration information regarding a conditional handover (CHO) procedure.